Hyflux, the water treatment firm she founded in 1989, is recovering from last year's dip in new orders from China, a key market.

Hyflux, the water treatment firm she founded in 1989, is recovering from last year's dip in new orders from China, a key market. In the first quarter net profits were up 25% to $4.6 million, thanks to the Middle East and African markets, where it is developing 2 large projects. Stock gained 42% in past year. She heads Singapore Compact, an organization that champions corporate social responsibility; also sits on board of trustees of the National University of Singapore, her alma mater.

Public fortunes were calculated using share prices and exchange rates as of Aug. 7. For privately held assets we estimated what they would be worth if public. Fortunes held by more than one person are denoted with \"& family.\"